Quarterly report pursuant to Section 13 or 15(d)

Debt (Senior Notes) (Details)

v3.19.1
Debt (Senior Notes) (Details) - Senior Notes
$ in Millions
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]  
Aggregate unamortized premium $ 27.1
2021 Senior Notes  
Debt Instrument [Line Items]  
Interest rate 6.75%
2025 Senior Notes  
Debt Instrument [Line Items]  
Interest rate 6.875%